add product_synonym

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@12877 ee4ac58c-ac51-4696-9907-e4b3aa274f04

etc/qualifier_mapping

@@ -21,6 +21,7 @@ GPI_anchored                note
 GPI_anchor_cleavage_site    note
 ID                          locus_tag
 Name                        primary_name
+product_synonym             product
 #
 # CHADO qualifiers to be ignored
 timelastmodified